find the exact value of cos (a+b), if a,b in Quadrant IV with sin a= -3/5 and cos b= 5/13

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter1: Trigonometry
Section1.7: Inverse Trigonometric Functions
Problem 6ECP
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find the exact value of cos (a+b), if a,b in Quadrant IV with sin a= -3/5 and cos b= 5/13

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